<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>数据代理</title>
</head>
<body>
  <script type="text/javascript">
    const obj1 = { x: 1 };
    const obj2 = { y: 2 };

    // 通过一个对象代理对另外一个对象中属性的操作【读和写】
    Object.defineProperty(obj2, 'x', {
      get() {
        return obj1.x;
      },

      set(value) {
        obj1.x = value;
      }
    })
  </script>
  
</body>
</html>